2001231223 has 4 divisors (see below), whose sum is σ = 2047771528. Its totient is φ = 1954690920.

The previous prime is 2001231191. The next prime is 2001231227. The reversal of 2001231223 is 3221321002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2001231223 - 2⁵ = 2001231191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001231197 and 2001231206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001231227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23270088 + ... + 23270173.

It is an arithmetic number, because the mean of its divisors is an integer number (511942882).

Almost surely, 2^2001231223 is an apocalyptic number.

2001231223 is a deficient number, since it is larger than the sum of its proper divisors (46540305).

2001231223 is an equidigital number, since it uses as much as digits as its factorization.

2001231223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46540304.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2001231223 is about 44735.1229237162. The cubic root of 2001231223 is about 1260.1795374886.

Adding to 2001231223 its reverse (3221321002), we get a palindrome (5222552225).

The spelling of 2001231223 in words is "two billion, one million, two hundred thirty-one thousand, two hundred twenty-three".